Keen Smell. The lynx has advantage on Wisdom (Perception) checks that rely on smell.

Pounce. If the lynx moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 12 Strength saving throw or be knocked prone. If the target is prone, the Nyxborn lynx can make one bite attack against it as a bonus action.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage and 5 (1d4 + 3) cold damage.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) slashing damage and 5 (1d4 + 3) cold damage.

Freezing burst (1/day).  The lynx releases a blast of freezing air in a 30-foot radius. Each creature in that area must make a DC 13 Constitution saving throw. On a failed save, the creature takes 6 (2d6) cold damage and is stunned for 6 seconds. On a success the creature takes half damage and isn't stunned.